The present study illustrates a clear functionalization chemistry for the synthesis of guanidine functionalized reduced graphene oxide (GfG). GfG has been successfully employed as an effective and selective adsorbent for the removal of noxious Cr(VI) from aqueous pollutants over a wide pH range. Different kinetic models, isotherm studies and thermodynamic parameters have been compared to elucidate the Cr(VI) adsorption chemistry and pathway. The formation of GfG and its active performance towards Cr(VI) remediation is evidenced from microscopic and different spectroscopic analyses. Finally, an attempt has been made by considering DFT based theoretical models to illuminate the mechanism of Cr(VI) amputation by GfG.

中文翻译：

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设计的功能化还原的氧化石墨烯在较宽的pH范围内吸附Cr（vi）：理论和实验角度

本研究说明了用于合成胍官能化的还原氧化石墨烯（GfG）的清晰的官能化化学反应。GfG已成功地用作有效的选择性吸附剂，用于在宽pH范围内从水性污染物中去除有毒的Cr（VI）。比较了不同的动力学模型，等温线研究和热力学参数，以阐明Cr（VI）的吸附化学和途径。GfG的形成及其对Cr（VI）修复的活性表现从微观和不同的光谱分析中得到了证明。最后，尝试通过考虑基于DFT的理论模型来阐明GfG截肢Cr（VI）的机制。